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A method for synthesizing high-performance barium ferrite with molten salt as flux and reaction medium

A technology of barium ferrite and reaction medium is applied in the field of preparation of barium ferrite materials, which can solve the problems of inability to meet the purity of high-performance barium ferrite, particle size distribution of particle agglomeration, narrow particle size distribution, etc. Good regular hexagonal flake micromorphology, narrow particle size distribution, good dispersion effect

Inactive Publication Date: 2011-11-30
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The synthesis of BaM ferrite is usually prepared by the traditional ceramic method at 1000-1250 °C, but the BaM ferrite prepared by this method is easy to cause particle agglomeration due to high calcination temperature and the inevitable fine grinding process is easy to make the particle size distribution Broadened and doped to a certain extent, it cannot meet the requirements of high purity, small particle size, narrow particle size distribution and plate-shaped particles that high-performance barium ferrite should have

Method used

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  • A method for synthesizing high-performance barium ferrite with molten salt as flux and reaction medium
  • A method for synthesizing high-performance barium ferrite with molten salt as flux and reaction medium
  • A method for synthesizing high-performance barium ferrite with molten salt as flux and reaction medium

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Embodiment 1

[0024] A method for synthesizing high-performance barium ferrite with molten salt as a flux and a reaction medium, comprising the following steps:

[0025] 1) Fe 2 o 3 with BaCO 3 Press Fe 3+ / Ba 2+ molar ratio n(Fe 3+ ) / n(Ba 2+ )=12 Weigh the corresponding amount of Fe respectively 2 o 3 , BaCO 3 Mix to get reactants;

[0026] 2) Weigh and mix NaCl and KCl according to the molar ratio of NaCl and KCl being 1:1 to obtain a mixed salt (or molten salt, which is the reaction solvent and molten salt medium);

[0027] 3) According to R=total mass of mixed salt / total mass of reactant=1, mix reactant and mixed salt, put into agate jar, add absolute ethanol (use absolute ethanol as the ball milling medium, the mass ratio of ball to material is 3 : 1), ball milled and mixed on a planetary ball mill (ball milled for 180 minutes), then dried (i.e. dried), then put into a corundum crucible with a cover and kept at 1000° C. for 3 hours in an electric furnace,

[0028] 4) After t...

Embodiment 2

[0030] A method for synthesizing high-performance barium ferrite with molten salt as a flux and a reaction medium, comprising the following steps:

[0031] 1) The reactant Fe 2 o 3 with BaCO 3 Press Fe 3+ / Ba 2+ molar ratio n(Fe 3+ ) / n(Ba 2+)=11.5 Weigh the corresponding amount of Fe respectively 2 o 3 , BaCO 3 Mix to get reactants;

[0032] 2) Weigh and mix NaCl and KCl according to the molar ratio of NaCl and KCl being 1:1 to obtain a mixed salt (or molten salt, which is the reaction solvent and molten salt medium);

[0033] 3) According to R=total mass of mixed salt / total mass of reactant=1, mix reactant and mixed salt, put into agate jar, add absolute ethanol (use absolute ethanol as the ball milling medium, the mass ratio of ball to material is 3 : 1), on a planetary ball mill, ball milled and mixed (ball milled for 180 minutes), then dried, then put into a corundum crucible with a cover and insulated at 1000°C for 3h in an electric furnace,

[0034] 4) After t...

Embodiment 3

[0039] A method for synthesizing high-performance barium ferrite with molten salt as a flux and a reaction medium, comprising the following steps:

[0040] 1) The reactant Fe 2 o 3 with BaCO 3 Press Fe 3+ / Ba 2+ molar ratio n(Fe 3+ ) / n(Ba 2+ )=11 Weigh the corresponding amount of Fe respectively 2 o 3 , BaCO 3 Mix to get reactants;

[0041] 2) Weighing NaCl and KCl according to the molar ratio of NaCl and KCl being 1:1 and mixing to obtain a mixed salt;

[0042] 3) According to R=total mass of mixed salt / total mass of reactant=1, mix reactant and mixed salt, put into agate jar, add absolute ethanol (use absolute ethanol as the ball milling medium, the mass ratio of ball to material is 3 : 1), on a planetary ball mill, ball milled and mixed (ball milled for 180 minutes), then dried, then put into a corundum crucible with a cover and insulated at 1000°C for 3h in an electric furnace,

[0043] 4) After the furnace temperature is naturally cooled to room temperature, th...

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Abstract

The invention relates to a preparation method of barium ferrite material. A method for synthesizing high-performance barium ferrite with molten salt as flux and reaction medium is characterized in that it comprises the following steps: 1) ferric oxide and barium carbonate are pressed by Fe3+: Ba2+ in a mol ratio of 10 to 12: 1. Weighing and mixing to obtain the reactant; 2) weighing NaCl and KCl according to the molar ratio of NaCl and KCl to be 1:1 and mixing to obtain the mixed salt; 3) according to the total mass of the mixed salt / total mass of the reactant=1~6, Mix the reactant with the mixed salt, ball mill and dry it, put it into a corundum crucible with a cover and place it at 750°C-1100°C for calcination for 1-3h; 4) After the reaction, cool down to room temperature naturally, wash and dry to obtain barium iron Oxygen. The method has the characteristics of simple process and low synthesis temperature, and the obtained barium ferrite has excellent performance.

Description

technical field [0001] The invention relates to a method for preparing barium ferrite material, in particular to a method for preparing barium ferrite material by using molten salt as a flux and a reaction medium. Background technique [0002] Compared with metal magnetic materials, ferrite has properties such as low dielectric constant, high resonance frequency, high resistivity, low density and excellent chemical stability. According to its crystal structure, ferrite can be divided into spinel type, garnet type and magnetoplumbite type (ie hexagonal ferrite). For spinel ferrite, it generally has a high initial magnetic permeability and has been widely used in the electronics industry. However, due to the Snoek limit, the resonance frequency of spinel ferrite is low, and the magnetic permeability of spinel ferrite will drop sharply to about 1 in the microwave band. Garnet-type ferrite has excellent gyromagnetic properties, low magnetic loss and dielectric loss. This type ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/626
Inventor 栗海峰
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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